Media captionHeavy monsoons are adding to the misery in the Rohingya camps in Bangladesh

Myanmar's top general has blamed Rohingya people for the crisis that has led to hundreds of thousands crossing into Bangladesh.

Gen Min Aung Hlaing said the Rohingya "has never been an ethnic group", and accused "extremists" of trying to form a stronghold in northern Rakhine state.

His army is accused of targeting civilians in an offensive there, forcing Rohingya to flee.

Myanmar denies this, and says it is responding to deadly militant attacks.

The UN has warned that offensive against the Rohingya - most of whom are Muslims, while Myanmar is 90% Buddhist - could amount to ethnic cleansing.

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Media captionWatch: Who are the Rohingya?

On Saturday UN Secretary General Antonio Guterres warned that the country's de facto leader Aung San Suu Kyi had "a last chance" to halt the army offensive before the situation becomes "absolutely horrible".

In a Facebook post on Sunday, Gen Min Aung Hlaing urged people and the media in Myanmar to unite over the "issue" of the Rohingya.

He said the military operation began after 93 clashes with "extremist Bengalis" - referring to Rohingya militants - that began on 25 August.

The violence, he added, was an organised attempt to build a stronghold in Rakhine state.

"They have demanded recognition as Rohingya, which has never been an ethnic group in Myanmar. (The) Bengali issue is a national cause and we need to be united in establishing the truth," his post said.

But Rohingya who have fled Myanmar since then say the military responded with a brutal campaign, burning villages and attacking civilians in a bid to drive them out.

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Bangladesh plans to restrict the movement of Rohingya who have fled Myanmar

The army's defence comes amid condemnation of the violence from across the world.

Aung San Suu Kyi is a Nobel Peace laureate who spent years under house arrest in junta-run Myanmar (Burma) but has played a key political role since her party won democratic polls in 2015. She is now facing growing criticism over the Rohingya issue.

On Sunday, UN chief Antonio Guterres urged her to stop the offensive in her address to the nation on Tuesday, warning that if she failed to so, "I don't see how this can be reversed in the future".

Speaking to the BBC's HARDtalk programme, the secretary general said it was clear that Myanmar's military "still have the upper hand" in the country.